diff --git a/Code/ReadCTFFile.m b/Code/ReadCTFFile.m
index a9f58ac..ee8891e 100644
--- a/Code/ReadCTFFile.m
+++ b/Code/ReadCTFFile.m
@@ -100,7 +100,7 @@ function ScanParamsData(FileStr, VarName)
     ScanParams.zstar = 0.1;
 else
     ScanParams.xstar = (ScanParams.PCX-(1-ScanParams.VHRatio)/2)/ScanParams.VHRatio;
-    ScanParams.ystar = ScanParams.PCY;
+    ScanParams.ystar = ScanParams.PCY/ScanParams.VHRatio;
     ScanParams.zstar = ScanParams.DD/ScanParams.VHRatio;
 end